This tool is great when doing guided practice problems involving one step equations. I copied a class set and put into page protectors so students could complete multiple problems continuously. Students simply write the original problem down into the "machine", based on the operation in the original problem students choose their path to solving the problem. Each path as a directions to help remind students what opposite operation they need to complete to solve. I teach multiple inclusion classes and this tool works great in those classes where students may need a little extra help to be successful!